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This package provides the classes and interfaces for cryptographic applications implementing algorithms for encryption, decryption, or
key agreement. 
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Stream ciphers are supported as well as asymmetric, symmetric and block ciphers. Cipher implementations from different providers are easily integratable thanks
to the SPI (Security Provider Interface) abstract classes. With class {@link javax.crypto.SealedObject} a programmer can secure an object by
encrypting it with a cipher.
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Authentication may be based on MAC (Message Authentication Code) such as HMAC (Hash MAC, i.e. with a SHA-1 hash function).
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@since Android 1.0
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